20Pcs Silicone Hole Plug: Package includes 50pcs black silicone hole plugs, enough quantity for your daily use and replacement Silicone Material: These hole covers made of silicone material, soft and flexible, are used to seal holes tubes, waterproof and dustproof, easy to fit most holes 5 Sizes Flexible Stopper: There are 5 sizes about our hole plugs, head diameter: 1.14 inch(2.9cm), 0.94 inch(2.4cm), 0.7 inch(1.8cm), 0.61 inch(1.55cm), 0.41 inch(1.05cm), bottom diameter: 0.83 inch(2.1cm), 0.63 inch(1.6cm), 0.55 inch(1.4cm), 0.49 inch(1.25cm), 0.3 inch(0.75cm), height: 0.55 inch(1.4cm), 0.54 inch(1.4cm), 0.49 inch(1.25cm), 0.47 inch(1.2cm), 0.39 inch(1cm). Each size contains 4pcs, you can choose size you need Easy to Use: Caps of black silicone rubber hole plug designed for easy installation and removal, no tools required Widely Used: Our silicone bottle seal plugs can be used as waterproof plugs, sealing plugs, test tube plugs, rubber bulkheads, covers, cylinder plug heads, threaded rubber plugs